用此語法拉我的頭髮語法錯誤

Question

我似乎遇到查詢語法錯誤，但似乎無法隔離它。我正在使用MS Access，當我運行查詢時，我在FROM子句中出現語法錯誤。

我有兩個表和他們在一對多的關係：

表1稱爲（客戶）具有以下字段：

ID 
FirstName 

表2稱爲（tblservice）具有以下字段：

serviceID 
Timing 
Total 
customerID <-Foreign Key 

首先查詢：

select c.id, c.firstname, avg(s.Total)/(select count(id) from customer) as LifetimeValue 
from tblservice as s join customer as c on s.id = c.id 
group by s.id 

第二次查詢（30天範圍）：

select c.id, c.firstname, avg(s.Total)/(select count(id) from customer) as LifetimeValue 
from tblservice as s join customer as c on s.id = c.id 
where (s.Timing)>=DateAdd("d",-30,Date()) 
group by s.id 

Answer 1

試試這個：

select c.id, c.firstname, avg(s.Total)/count(c.id) as LifetimeValue 
from tblservice as s inner join customer as c on s.id = c.id 
group by c.id, c.firstname 

和

select c.id, c.firstname, avg(s.Total)/count(c.id) as LifetimeValue 
from tblservice as s inner join customer as c on s.id = c.id 
where (s.Timing)>=DateAdd("d",-30,Date()) 
group by c.id, c.firstname 

不能由他們選擇c.id和c.firstname，除非你組。您可以使用count(c.id)，因爲您已經按c.id分組。雖然我沒有在MS Access中使用SQL。所以我不是100％肯定的。試試看。

Answer 2

MS Access可能會要求您使用INNER JOIN而不僅僅是JOIN。